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Chip uses 30,000 times less power in sleep mode

University of Michigan boffins claim major breakthrough

Researchers at the University of Michigan have developed a low-power
microchip which they claim uses 30,000 times less power in sleep mode, and 10
times less in active mode, than comparable commercially available chips.

The Phoenix processor draws just 30 picowatts (trillionths of a watt) in
sleep mode, meaning that a normal watch battery would run for 263 years.

Phoenix development has been jointly led by Mingoo Seok and Scott Hanson,
doctoral students in the Department of Electrical Engineering and Computer
Science at the University of Michigan.

Hanson will present the design on 20 June at the Engineers' Symposium on VLSI
Circuits run by the Institute of Electrical and Electronics Engineers.

Phoenix measures a modest one square millimetre, which the researchers admit
is nothing special. However, the fact that its thin-film battery is the same
size is a major achievement, according to the team.

"In most cases, batteries are much larger than the processors they power,
drastically expanding the size and cost of the entire system," said David
Blaauw, a professor in the Department of Electrical Engineering and Computer
Science.

"For instance, the battery in a laptop computer is about 5,000 times larger
than the processor and provides only a few hours of power."

The team hope that the breakthrough will help advance the development of
cutting-edge sensor-based devices such as medical implants, environment monitors
and surveillance equipment.

"Our system, including the battery, is projected to be 1,000 times smaller
than the smallest known sensing system today," said Professor Blaauw. "It could
allow for a host of new sensor applications."